Johann martignoni



(Model.)

. J. MARTIGNONI.

GROOVE GUTTER.

Patented Feb` 6, 1883.

lwmulugmphun Wushu-.gwn D c UNTTED STATES PATENT Omron,

JOHANN MARTIGNONI, OF BOOKENHEIM, GERMANY.

GROOVE=CUTTER.

SPECIFICATION forming part of Letters Patent No. 271,646, dated February 6, 1883.

Application filed December 4, 1882. (Model.) Patented in GermanyJanuary Q7, 1882, No. 2,035; in Belgium January 28, 1882, No. 56,917; in France February 17, 1882, No. 147,412, und in England July 17, 1882, No. 3,384.

ment in GrooveGutters, (for which I have ob-A tained a patent in Belgil1ni,No.56,917, bearing date 28th of January, 1882; in France, No.

147,412, bearing'date 17th February, 1882; in

Germany, No. 2,055 I, bearing date 27th January, 1882; and in England, provisional protection, No. 3,381, bearing date 17th July, 1882,) of which the i'ollowingis a specification.

Hitherto milling-tools or revolving cutters provided with sharp and thin triangular edges or teeth have been ehietiy used for cutting` grooves in metal and other hard material.

My invention consists in replacing these tools by the groove-cutter illustrated by the accompanying drawings, of which- Figure lis a side view7 and Fig. 2 an end view, ofthe new tool.

The bend K of the cutter is turned to the shape of a cylinder, and the end is so rounded that an axial section of the head presents the exact shape ofthe groove to be out. On each side of the head, (right and left,) and oblique to the axis A, a deep round hollow, b or b,1s out out, so as to form two sharp cutting-edges, c c',

situated right and left of the axis on the diameter B.

The groove-Cutter so constructed possesses the following advantages over the usual milling-tools or cutters having a nuinber'ot triangular thin teeth. It can be made more easily and cheaply. It requires less material. Its two strong rounded edges 0 o cut the steel more easily, last much longer, and can be sharpened more easily and in less time. Owing to the hollows being round and proportionally wide, the chips cannot accumulate in the said hollows Z b', which form the cutting-edges, and cannot therefore injure or block the cutter, be-

ingeasily thrown out ot' the oblique holloWs4 by the rapid revolution of the cutter.

I claim as my invention- A groove-cutter having a cylindrical head,

K, with rounded end, and in which cuttingedges e e are produced by means of two obliquely-eut hollows, b b', substantially as described and illustrated.

In testimony whereof1 I have signed this specieation in the presence ot' two subscribing witnesses.

JOHANN MARTIGNONI.

Witnesses:

F. VOGELER, ED. JULIEN J AssoN. 

